Coiler for the hook in sewing machines



Feb. 3, 1959 A. MORO 2,871,809

COILER FOR THE. HOOK IN SEWING MACHINES Filed May 25, 1956 2 Sheets-Sheet 1.

Fig. 1

Inventor fi/vro/v/o Moeo A itorneys Fb. 3, 1959 A. MORO 2,871,809

COILER FOR THE HOOK IN SEWING MACHINES Filed May 25, 1956 2 Sheets-Sheet 2 In ventor fiA/raxwo M060 Attorneys United S t-ates Patent COILER non THE HooK IN SEWING MACHINES Antonio Moro, Milan, Italy, assignor to S. p. A. Fratelli Borletti, Milan, Italy Application May 25, 1956, Serial No. 587,403 Claims priority, application Italy May 27, 1955 1 Claim. (Cl. 112--218) In domestic sewing machines the coiler for Winding the thread upon the hook spool is usually mounted on a support fixed externally to the arm of the machine, this arrangement being expensive and constituting an unpleasant encumbrance. In some recent types of machine the coiler is housed in a cavity of the upper portion of the arm of the machine, but this limits the inner space of the arm and makes the manufacture more expensive.

The coiler which is the object of the present invention eliminates all the above inconveniences.

The coiler of the invention is characterized by the following; the rotary pin forming the spool carrying element is integral with a friction wheel actuated by the flywheel of the machine, is located above an internal horizontal wall of a cavity at the end of the cover of the upper part of the machine-arm adjacent to the flywheel itself, and is rotatably mounted upon one of the ends of an oscillating lever journalled at the other end upon the i said wall, on one of the edges of which is hinged a cover for said cavity which, when closed, perfectly matches with the outside surface of the cover of the machine-arm.

Preferably, the oscillating lever is journalled upon the lower surface of the horizontal wall, and the rotary coiler pin is mounted upon said lever in correspondence with an arcuately elongated slot in said wall having its center on the journal axis of the lever under which is located the friction wheel carried by the rotary pin.

Further particulars of the coiler according to the invention will be understood from the following description of an example of an embodiment illustrated in the accompanying drawings, in which:

Fig. 1 is a plan View of the coiler applied to a sewing machine;

Fig. 2 is a section of it, according to line IIII of Fig. 1;

Fig. 3 is a perspective View of the exterior profile of a sewing machine, with a coiler in accordance with the invention.

In cover 1 of the upper part of the machine-arm there is formed the cavity 2. In the horizontal wall 3 of said cavity there is an arcuately elongated slot 4 through which projects pin 5 mounted for rotation upon the end 6 of the oscillating lever 7, rotatably journalled on 8; the slot 4 is arcuately elongated and has its center in the fulcrum axis of 7. The spool, over which the thread is to be wound, is slipped on pin 5.

To the lower portion 9 of pin 5 is fastened the rubber edged wheel 10, which, when in contact with surface 11 of flywheel 12 is frictionally caused to turn by the rotating flywheel itself.

A spring 13 is tensioned by having one end thereof attached to a pin 7' projecting downwardly from lever 7 and a pin 3' fixed to the bottom of wall 3. Tension spring 13 will lie in a line X-X passing through. pin 7 and on one side of journal-axis 8 of lever '7 to keep the rubber edged wheel 10 in contact with flywheel 12; said spring will take position Y-Y, which is on a line passing through pin 7' and on the other side of journal-axis 8 of lever 7, to keep wheel 10 away from the flywheel 11. Stop 14 causes the wheel 10 to break contact with flywheel 12 when the winding in the spool has reached a predetermined diameter, causing pin 5 to come to a stop. Stop 14 is adjustable and can be fixed in a predetermined position corresponding to a determined filling diameter of the spool. When pin 5 has stopped, the same is moved in the direction of the arrow 15 so that arm 7 passing over the dead centre position Z-Z snaps into position yy by spring 13.

When the coiler is being used, cover 16 is lifted and set in the position shown by Fig. 3 so that the coiler remains accessible for use; the operation of the coiler being over, cover 16 is lowered as in Fig. 2, enclosing the coiler and re-establishing the continuity of the outer surface 1 with surface 16.

What I claim is:

A coiler for the hook spool for use in connection with a sewing machine having a horizontal arm provided with a cover having a depression therein provided with a bottom wall, a flywheel located outside one end of said arm, said coiler comprising a rotary pin for the hook spool, a friction wheel integral with said pin and mounted for rotation by the flywheel, an oscillating lever journalled on the lower surface of the bottom wall and rotatably supporting said pin and friction wheel, said bottom wall having an arcuately elongated slot through which the pin projects outwardly above the bottom wall, spring means having its ends connected to the lower surface of the bottom wall and to the oscillating lever for keeping the friction wheel in contact with or away from the flywheel, and an adjustable stop means located on the upper surface of the bottom wall and containing the outside perimeter of the hook spool for breaking contact between the friction wheel and flywheel when the hook spool is completely wound, and a curved member hinged to the bottom wall for enclosing the coiler and continuing the outer surface of the cover of the horizontal arm of the machine.

References Cited in the file of this patent UNITED STATES PATENTS 2,745,365 Zink May 15, 1956 2,784,917 Bono Mar. 12, 1957 FOREIGN PATENTS 452,782 Italy Oct. 29, 1949 

